The best way is to reset it with a scanner, but if you remove the ecm fuse for a minute it will reset. If there is a problem with the light coming on, then the system should be scanned and the faulty component(s) repalced/repaired.
If you have further questions on this just reply.
Thanks for asking!
Unfortunatly, you cant just unplug the lamp, it is tested while performing the emissions test, and will fail the test if it doesnt light up with the key on check (unless the guy forgets to look at it) :-)
The sensors will have to be replaced to get the light to go off. Sorry, but there is really no quick fix for this.
Best of luck my friend!